| Refraction | Snell's Law | Thin Lenses | Critical Angle | Potpourri |
| 10 | 10 | 10 | 10 | 10 |
| 20 | 20 | 20 | 20 | 20 |
| 30 | 30 | 30 | 30 | 30 |
| 40 | 40 | 40 | 40 | 40 |
| 50 | 50 | 50 | 50 | 50 |
| Final Question | ||||
Speed, frequency and wavelength: which value doesn't change when light refracts?
Speed, frequency and wavelength: which value doesn't change when light refracts?
Frequency
Draw a picture of a light ray entering a flat glass surface from air and refracting. Label the angle of incidence and the angle of refraction.
Draw a picture of a light ray entering a flat glass surface from air and refracting. Label the angle of incidence and the angle of refraction.
The ray should bend towards the normal
What is the the equation relating the speed of light in a vacuum with the speed of light in a medium and refractive index?
What is the the equation relating the speed of light in a vacuum with the speed of light in a medium and refractive index?
n=c/v
A friend throws a coin into a pool. You close your eyes and dive toward the spot where you saw it from the edge of the pool. When you reach the bottom, will the coin be in front of you or behind you?
A friend throws a coin into a pool. You close your eyes and dive toward the spot where you saw it from the edge of the pool. When you reach the bottom, will the coin be in front of you or behind you?
Behind - the image will appear farther away than the coin actually is.
Two colors of light (X and Y) are sent through a glass prism, and X is bent more than Y. Which color travels more slowly in the prism?
Two colors of light (X and Y) are sent through a glass prism, and X is bent more than Y. Which color travels more slowly in the prism?
X
State Snell's Law and define all its terms - include a diagram.
State Snell's Law and define all its terms - include a diagram.
n1sin(theta1)=n2sin(theta2)
Find the angle of refraction for a ray of light that enters a bucket of water from air at an angle of 25 degrees to the normal.
Find the angle of refraction for a ray of light that enters a bucket of water from air at an angle of 25 degrees to the normal.
18.5 degrees
A ray of light strikes a glass window of thickness 1cm at an angle of 35 degrees to the normal. Calculate the angle of incidence at the back surface of the window, and the angle of refraction as it exits the back of the window. The refractive index of the window is 1.5.
A ray of light strikes a glass window of thickness 1cm at an angle of 35 degrees to the normal. Calculate the angle of incidence at the back surface of the window, and the angle of refraction as it exits the back of the window. The refractive index of the window is 1.5.
22.48 degrees and 35 degrees
The angle of incidence and the angle of refraction for light going from air into a material of higher refractive index are 63.5 and 42.9 degrees, respectively. What is the index of refraction of this material?
The angle of incidence and the angle of refraction for light going from air into a material of higher refractive index are 63.5 and 42.9 degrees, respectively. What is the index of refraction of this material?
1.31
The laws of refraction and reflection are the same for sound as for light. The speed of sound is 340 m/s in air and 1510 m/s in water. If a sound wave that is traveling in air approaches a flat water surface with an angle of incidence of 12 degrees, what is the angle of refraction?
The laws of refraction and reflection are the same for sound as for light. The speed of sound is 340 m/s in air and 1510 m/s in water. If a sound wave that is traveling in air approaches a flat water surface with an angle of incidence of 12 degrees, what is the angle of refraction?
67 degrees
Draw a diagram showing the 3 reference rays you would use to find an image from a converging lens.
Draw a diagram showing the 3 reference rays you would use to find an image from a converging lens.
p. 571
Draw a diagram showing the 3 reference rays you would use to find the image of a diverging lens.
Draw a diagram showing the 3 reference rays you would use to find the image of a diverging lens.
p. 573
An object is placed 20cm in front of a converging lens of focal length 10cm. Find the image distance and magnification and determine if it is real or virtual and rightside up or inverted.
An object is placed 20cm in front of a converging lens of focal length 10cm. Find the image distance and magnification and determine if it is real or virtual and rightside up or inverted.
di=20cm, M=-1, real, inverted
An object is placed in front of a diverging lens with a focal length of 20cm. Find the image distance,magnification, type of image and orientation when the object distance is 40cm.
An object is placed in front of a diverging lens with a focal length of 20cm. Find the image distance,magnification, type of image and orientation when the object distance is 40cm.
di=-13.3cm, M=0.332, virtual, upright
A diverging lens is used to form a virtual image of an object. The object is 80cm in front of the lens and the image is 40cm in front of the lens. Determine the focal length of the lens.
A diverging lens is used to form a virtual image of an object. The object is 80cm in front of the lens and the image is 40cm in front of the lens. Determine the focal length of the lens.
-80 cm
Give the expression for the sin(theta critical) and the conditions under which it applies.
Give the expression for the sin(theta critical) and the conditions under which it applies.
sin(theta critical)=nr/ni for ni>nr
Find the critical angle for light traveling through ice (n=1.309) into air.
Find the critical angle for light traveling through ice (n=1.309) into air.
49.8 degrees
Is it possible for total internal reflection to occur when light is incident from air on water? Why?
Is it possible for total internal reflection to occur when light is incident from air on water? Why?
No, n-air
A ray of light traveling in air strikes the surface of a liquid. If the angle of incidence is 30 degrees and the angle of refraction is 22 degrees, find the critical angle for light traveling from the liquid back into the air.
A ray of light traveling in air strikes the surface of a liquid. If the angle of incidence is 30 degrees and the angle of refraction is 22 degrees, find the critical angle for light traveling from the liquid back into the air.
48.8 degrees
A fiber-optic cable used for telecommunications has an index of refraction of 1.53. For total internal reflection of light inside the cable, what is the minimum angle of incidence to the inside wall of the cable if the cable is in air?
A fiber-optic cable used for telecommunications has an index of refraction of 1.53. For total internal reflection of light inside the cable, what is the minimum angle of incidence to the inside wall of the cable if the cable is in air?
40.8 degrees
Light of different wavelengths will travel through a medium (such as glass) at different speeds. This causes the refractive index of a medium to vary with the frequency of light. What is this phenomenon called?
Light of different wavelengths will travel through a medium (such as glass) at different speeds. This causes the refractive index of a medium to vary with the frequency of light. What is this phenomenon called?
Dispersion
What phenomenon is caused by the atmospheric refraction of light?
What phenomenon is caused by the atmospheric refraction of light?
Mirage
If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset change?
If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset change?
Sunrise would be later and Sunset would be earlier.
When light passes through a prism, which will be bent more, the red or green light?
When light passes through a prism, which will be bent more, the red or green light?
Green
At what angle with respect to the ray from the sun are the red and violet rays after they leave a raindrop to form a rainbow?
At what angle with respect to the ray from the sun are the red and violet rays after they leave a raindrop to form a rainbow?
42 and 40 degrees, respectively
A ray of light travels across a liquid-to-glass interface. The index of refraction for the liquid is 1.75 and that of the glass is 1.52. If the light meets the interface at an angle of 59 degrees, predict whether the light will be refracted or whether it will undergo total internal reflection.
A ray of light travels across a liquid-to-glass interface. The index of refraction for the liquid is 1.75 and that of the glass is 1.52. If the light meets the interface at an angle of 59 degrees, predict whether the light will be refracted or whether it will undergo total internal reflection.
Refracted
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